Prayers were said at churches across India Sunday for an elderly nun who was gang-raped at a convent in an attack that has intensified anger over sexual violence and fuelled fears among beleaguered Christians.

India has banned the broadcast of a controversial documentary in which one of the men who gang-raped and murdered a student is shown blaming the victim -- a move the film's maker called "arbitrary censorship".

From dog attacks, strangulation and rape, to injured fishermen being thrown overboard and left to drown, trafficked people can suffer extreme violence and severe health problems no matter where they end up working, researchers have found.